Orochimaru (大蛇丸, Orochimaru) was one of the Konohagakure's three legendary ninja or Sannin, and is known as the "Giant Snake" (due to his affinity to snakes). He is the primary antagonist for most of Part 1. He was the student that everyone believed would become the Fourth Hokage, but his hunger for power led him to commit dark experiments and practice forbidden jutsu (it has also been explained that his descent into darkness may have been caused by the death of his parents).(Wikimedia)